they work for the operational technology division and they've set up facilities at a restricted location near the boston harbor. this is where the evidence and the video is brought and the agents are masters at using their facial recognition software. the new science of converting a face into a name demonstrated here by grant fredericks who runs an indiana company that was used by the fbi following the 9/11 attacks. >> going from a face to a name is by getting the public's help. it will likely be the face will be at distance, trying to do some kind of facial mapping or electronic process to identify the face will not be effective. >> reporter: the internet has been full of amateurs trying to do it themselves. claiming that maybe they found the bombers. and fredericks says that has a huge downside. >> there's a danger in the public playing junior g-man and identifying potential suspects and putting them on the news. you don't know how that's going to affect an innocent person. and so it's a very dangerous game to play. >> reporter: in addition to the videos and photos, the fbi tech agents